Every situation is unique, so none of us has an all encompassing answer. But, I would put an end to any suffering you have over it. I wouldn't be rude to your parents, leave that to the hypocrites in the Kingdom Halls.
Invite them to your wedding, but don't be surprised if they fail to show. The Bible says we leave our families and stick to our mates. Let them know you love them and always will, then get on with your life. One day, you will have your own family and they will be your top priority, as well as the major source of love and satisfaction in your life.
Right now, I am struggling with a wife whose support is more for the dubs than for me. Since I DA's, her attitude is that I knew what to expect, as far as shunning. Of course I did. But, the only time I get upset is when her or her kids dub buddies come into my house and expect me to leave the room, look down their noses at me, and then wish to utilize all the possessions and comforts I am providing, most of which I had before I was remarried. Then too, since my profession is an auto technician, some still expect me to be "johnny on the spot" when they have a car problem, but shun me the rest of the time. No way, Jose!
As far as the JWs are concerned, I follow the golden rule and treat them as they treat me.
It hurts to leave a parental family behind, but if they are the source of anguish, I would leave them behind and build a new and loving family of your own. If they wake up and come to you, accept them, warily. But, first and foremost, build a family with your spouse and whatever children you have. They will come first.
Just my opinion, mind you
If God's Spirit is filling a Kingdom Hall, how is it that Satan can manuever the ones within that Kingdom Hall at the same time?